US4850004A - Method and system for acquiring computerized tomogram data - Google Patents

Method and system for acquiring computerized tomogram data Download PDF

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Publication number
US4850004A
US4850004A US07/178,004 US17800488A US4850004A US 4850004 A US4850004 A US 4850004A US 17800488 A US17800488 A US 17800488A US 4850004 A US4850004 A US 4850004A
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data
detector
ray
source
acquiring
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US07/178,004
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Yasuo Saito
Yasuo Nobuta
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Toshiba Corp
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Toshiba Corp
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Assigned to KABUSHIKI KAISHA TOSHIBA, 72 HORIKAWA-CHO, SAIWAI-KU, KAWASAKI-SHI, JAPAN A CORP. OF JAPAN reassignment KABUSHIKI KAISHA TOSHIBA, 72 HORIKAWA-CHO, SAIWAI-KU, KAWASAKI-SHI, JAPAN A CORP. OF JAPAN ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: NOBUTA, YASUO, SAITO, YASUO
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B6/00—Apparatus or devices for radiation diagnosis; Apparatus or devices for radiation diagnosis combined with radiation therapy equipment
    • A61B6/02—Arrangements for diagnosis sequentially in different planes; Stereoscopic radiation diagnosis
    • A61B6/03—Computed tomography [CT]
    • A61B6/032—Transmission computed tomography [CT]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S378/00—X-ray or gamma ray systems or devices
    • Y10S378/901—Computer tomography program or processor

Definitions

  • This invention relates to a method and system for acquiring CT data by using continuous radiation in a CT apparatus.
  • an X-ray source generating a fan beam and an X-ray detector having channels opposite to the X-ray source are rotated in unison around a subject under examination so as to acquire X-ray data transmitted through the object.
  • the X-ray data is simultaneously acquired by all the channels of the X-ray detector, and the data acquired by the respective channels is transferred, in sequential fashion, to a data processor.
  • the channels of the X-ray detector are operated on a time-division basis to sequentially acquire the X-ray data, the X-ray data acquired by each channel being transferred to the data processor immediately upon acquisition.
  • FIG. 1A when X-ray source 1 and X-ray detector 4, which has channels opposite to source 1, are rotated in direction 3a, with the center 2 of object P as the axis of rotation--in other words, while X-ray source 1 generating an X-ray fan beam is moved from a position 1a to a position 1b--X-ray detector 4 acquires X-ray data, in sequential fashion, from the data of first channel 4b, corresponding to X-ray pass 7, to the data of 512th channel 4a, corresponding to X-ray pass 8a, along the data acquiring direction 6 (refer to FIG. 2).
  • source 1 When, on the other hand, source 1 is rotated in the opposite direction 3b, as is shown in FIG. 1B, data is acquired sequentially along direction 6, from first channel 4b corresponding to X-ray pass 7 of source 1 at position 1a, to 512th channel 4a corresponding to X-ray pass 8b of source 1 at position 1c.
  • intersectional point 10 (the imaginary point of this case) of X-ray passes 7 and 8b is located outside the actual position 1a or 1c of source 1 with respect to object P.
  • An object of this invention is to provide a method and system for acquiring CT data without data correction of different scaling factors for the rotational direction of an X-ray source arranged in a CT apparatus.
  • a method for acquiring computerized tomogram data of a subject by using a radiation source and a detector with channels comprising the steps of: switching a rotational direction of the radiation source, switching a data acquiring direction of the detector by switching the rotational direction of the radiation source, and acquiring the computerized tomogram data of the subject, in accordance with the switched data acquiring direction of the detector.
  • a system for acquiring computerized tomogram data of a subject by using a radiation source and a detector with channels comprising: first switching means for switching a rotational direction of the radiation source; second switching means for switching a data acquiring direction of the detector by the rotational direction of the radiation source switched by the first switching means; and, means for acquiring the computerized tomogram data of the subject, in accordance with the data acquiring direction of the detector switched by the second switching means.
  • FIGS. 1A and 1B are views for explaining the conventional operations in CT data acquisition
  • FIG. 2 is a timing chart of the conventional CT data acquisition
  • FIG. 3 shows an arrangement of a CT data acquisition system
  • FIG. 4 is a flowchart showing an operation of the microprocessor in the CT data acquisition system
  • FIGS. 5A and 5B are views showing the operation of CT data acquisition according to an embodiment of this invention.
  • FIGS. 6A and 6B are timing charts of CT data acquisition in the embodiment of this invention.
  • external case 13 is provided with opening 14 into which object P under examination is inserted.
  • X-ray source 11 and X-ray detector 12 are disposed in external case 13 such that they oppose to each other with object P interposed therebetween and can be rotated around object P by a motor and a motor driving circuit not shown.
  • Data obtained by X-ray detector 12 is amplified in amplifier 16, integrated in integrator 17, and then input via multiplexer 18 into data processing unit 19.
  • Data processing unit 19 comprises an analog-to-digital (A/D) converter (not shown), and reconstructs a CT image by using the digital data converted by A/D converter.
  • Microprocessor 15 supplies signal S1 for specifying a rotational direction of X-ray source 11 and X-ray detector 12 disposed within external case 13, signal S2 for specifying direction of data acquisition in the plurality of channels of X-ray detector 12, and signal S3 for CT image reconstruction processing by data obtained by X-ray detector 12.
  • microprocessor 15 supplies command signal S1 to the motor driving circuit for switching the rotational direction of X-ray source 11 and X-ray detector 12.
  • step F2 microprocessor 15 supplies command signal S2 to multiplexer 18 so that the data acquiring direction in the channels of X-ray detector 12 coincides with the rotational direction of X-ray source 11 and X-ray detector 12 which is switched by command signal S1 supplied in step F1.
  • the data acquisition is started by steps F1 and F2.
  • step F3 command signal S3 is supplied to data processing unit 19 so that a CT image is reconstructed by acquired data.
  • X-ray source 11 and X-ray detector 12 having 512 channels are rotated in direction 20a, in other words, while source 11 moves from position 11a to position 11b, the data acquisition for one fan beam is performed in sequence from first channel 12b to 512th channel 12a as shown in FIG. 6A. More specifically, X-ray detector 12 acquires the data in first channel 12b for X-ray pass 22a first, data in turn along the same direction as rotational direction 20a of X-ray source 11 and X-ray detector 12, and finally the data in 512th channel 12a for X-ray pass 23a. As a result, the data based on a fan beam from intersection 21a (imaginary point) of the X-ray passes is acquired. Noted that X-ray source 11 and X-ray detector 12 rotate taking the center 24 of object P as axis of rotation.
  • microprocessor 15 supplies signal S2 for switching the data acquiring direction 23b of X-ray detector 12 to coincide with the rotational direction 20b of X-ray source 11 and X-ray detector 12. That is, data is acquired sequentially from 512th channel 12a to first channel 12b as shown in FIG. 6B. Noted that the data in 512th channel 12a is based on X-ray pass 23b from source 11 at position 11a, and the data in first channel 12b on X-ray pass 22b from source 11 at position 11c.
  • intersection 21b of the X-ray passes in FIG. 5B and the intersection 21a in FIG. 5A are on concentric circles. Namely, the position of the imaginary source of the fan beam in this case coincides with that of FIG. 5A regardless of the rotational direction of the X-ray source and the X-ray detector. In addition, the position 21b of the imaginary source is closer to object P than the actual position 11a or 11b of the X-ray source.

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Medical Informatics (AREA)
  • Optics & Photonics (AREA)
  • Biomedical Technology (AREA)
  • Biophysics (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Theoretical Computer Science (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Pulmonology (AREA)
  • Pathology (AREA)
  • Radiology & Medical Imaging (AREA)
  • Physics & Mathematics (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Molecular Biology (AREA)
  • Surgery (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Apparatus For Radiation Diagnosis (AREA)
  • Analysing Materials By The Use Of Radiation (AREA)
US07/178,004 1987-04-10 1988-04-05 Method and system for acquiring computerized tomogram data Expired - Fee Related US4850004A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP62089591A JPS63255042A (ja) 1987-04-10 1987-04-10 Ｃｔ装置におけるデ−タ収集方式
JP62-89591 1987-04-10

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JP (1) JPS63255042A (ja)
DE (1) DE3811823A1 (ja)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4934832A (en) * 1988-05-25 1990-06-19 Siemens Aktiengesellschaft Computer tomography apparatus with resiliently mounted radiation detector
US5278399A (en) * 1989-03-28 1994-01-11 Toppan Moore Company, Ltd. Data entry unit

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5032990A (en) * 1989-05-30 1991-07-16 General Electric Company Translate rotate scanning method for x-ray imaging
DE4209376A1 (de) * 1992-03-23 1993-09-30 Siemens Ag Flächerstrahl-Computertomograph
DE4209375A1 (de) * 1992-03-23 1993-09-30 Siemens Ag Fächerstrahl-Computertomograph

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4097744A (en) * 1974-11-13 1978-06-27 Emi Limited Radiographic apparatus having repetitive movement of the origin of the radiation
US4580219A (en) * 1983-05-02 1986-04-01 General Electric Company Method for reducing image artifacts due to projection measurement inconsistencies

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1493594A (en) * 1974-01-31 1977-11-30 Emi Ltd Radiography
GB1572599A (en) * 1976-02-10 1980-07-30 Emi Ltd Radiography
DE2626084A1 (de) * 1976-06-10 1977-12-22 Siemens Ag Roentgenschichtgeraet zur herstellung von transversal-schichtbildern

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4097744A (en) * 1974-11-13 1978-06-27 Emi Limited Radiographic apparatus having repetitive movement of the origin of the radiation
US4580219A (en) * 1983-05-02 1986-04-01 General Electric Company Method for reducing image artifacts due to projection measurement inconsistencies

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4934832A (en) * 1988-05-25 1990-06-19 Siemens Aktiengesellschaft Computer tomography apparatus with resiliently mounted radiation detector
US5278399A (en) * 1989-03-28 1994-01-11 Toppan Moore Company, Ltd. Data entry unit

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Publication number Publication date
DE3811823A1 (de) 1988-10-20
JPS63255042A (ja) 1988-10-21
DE3811823C2 (ja) 1993-06-24

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